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FAIR VALUE MEASUREMENTS - Schedule of AFS Sold (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 26, 2018	Dec. 27, 2017	Dec. 28, 2016
Available-for-sale securities:
Gross proceeds from sales and redemptions		$ 2,144	$ 2,223	$ 938
Cost basis of sales and redemptions		2,160	2,271	956
Gross realized gains included in net income		2	1	2
Gross realized losses included in net income		(18)	(49)	(20)
Amounts reclassified out of accumulated other comprehensive loss	[1]	$ 16	$ 47	$ 19
[1] Net of tax benefit of $0 for fiscal years ended December 26, 2018, December 27, 2017 and December 28, 2016.

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